Automatic lathe

ABSTRACT

A high speed automatic lathe of the movable spindle head type has a quill spindle comprising a hollow spindle provided with a collet chuck rotatable in a non-rotating but axially movable quill. A tool frame for supporting a plurality of tools is made in one piece with a work spindle frame in which the quill spindle is mounted for axial movement thereby assuring rigidity of construction and accuracy of positioning of the tools relative to the spindle. The spindle is rotated at high speed by a high frequency motor mounted in the work spindle frame in axial alignment with the spindle and provided with an axial bore for passage of a work piece through the motor to the spindle. The quill spindle is movable in an axial direction relative to the motor to provide feeding movement of the work piece while maintaining a direct drive connection between the spindle and the motor. Axial movement of the quill spindle is controlled by a plurality of cooperating cams, thereby simplifying cam layout machine. Cam operated means is also provided for opening and closing the chuck of the spindle while the spindle is rotating at high speeds and without interfering with axial movement of the spindle. The spindle, the cam shaft and a tool attachment having tools for machining the end of a work piece are driven by separate motors thereby avoiding gear boxes and interconnecting shafting.

United States Patent 1191 Nemoto et al.

[ 1 AUTOMATIC LATHE [73] Assignee: Kabushiki Kai'sha Daini Seikosha,

Tokyo, Japan 22 Filed: Dec. 30, 1971 21 Appl. N0.: 214,223

[30] Foreign Application Priority Data Dec. 30, 1970 Japan 45 127223[52] [1.5. CI. 82/25 [51] Int. Cl B23b 13/00 [58] Field of Search 82/2.5

[56] References Cited v v UNITED STATES PATENTS 2,376,476 5/1945Chatelain 82/25 R 3,596,545 8/1971 Eisenhardt. 82/25 R 3,362,269 l/l968Bertoglio 82/25 R 3,283,391 11/1966 Thompson et a1... 82/25 R 2,374,1124/1945 Lloyd..'. 82/2.5 R 2,373,155 4/1945 White 82/2.5 R 2,343,914 31944 Lloyd 82 25 R 3,626,792 12/1971 Eichenhofer.. 82/2.5 R x 3,579,6865/1971 Sorenson 82/25 R X FOREIGN PATENTS OR APPLICATIONS 935,87412/1955 Germany ..82/2.5R

1451 Apr. 2, 1974 [57] I ABSTRACT A high speed automatic lathe of themovable spindle head type has a quill spindle comprising a hollowspindle provided with a collet chuck rotatable in a nonrotating butaxially movable quill. A tool frame for 1 supporting a plurality oftools is made in one piece with a work spindle frame in which the quillspindle is mounted for axial movement thereby assuring rigidity ofconstruction and accuracy of positioning of the tools relative to thespindle. The spindle is rotated at high speed by a high frequency motormounted in the work spindle frame in axial alignment with the spindleand provided with an axial bore for passage of a work piece through themotor to the spindle. The quill spindle is movable in an axial directionrelative to the motor to provide feeding movement of the work piecewhile maintaining a direct drive connection between the spindle and themotor.'Axial movement-of the quill spindle is controlled by a pluralityof cooperating cams, thereby. simplifying cam layout machine. Camoperated means is also provided for opening and closing the chuck of thespindle while the spindle is rotating at high speeds and withoutinterfering with axial movement of the spindle. The spindle, the camshaft and atool attachment having tools for machining the end of a workpiece are driven by separate motors thereby avoiding gear boxes andinterconnecting shafting.

9 Claims, 6 Drawing Figures PATENTEDMR 2 m4 SHEET 3 vHF 3 The presentinvention relates to automatic lathes and particularly to automaticlathes of the movable spindle head type, sometimes referred to as theSwiss-type.

With automatic lathes of the movable work spindle head type, it hasheretofore been impossible to obtain reliable stable operation at highspeeds. As a matter of fact, it has been virtually impossible to performprecision work at speeds of more than 20,000 r.p.m.

It is accordingly an object of the present invention to provide anautomatic lathe which by virtue of its novel construction is capable ofmachining small diameter articles at high speed and with high precision.

' A feature of the present invention is that the work spindle frame andthe tool frame are constructed as a single body, thereby greatlyincreasing the rigidity of the tool-holding frame with relation to thework spindle frame. In previous constructions, a work spindle head whichslides on the sliding surface of the bed and a tool frame, whichsupports a plurality of tools and has a guide bushing for axiallysupporting the work, are mounted on the bed individually. Since thesupporting surface of the tool frame is necessarily limited and is smallcompared with the height of the tool frame, the rigidity is reduced andvibration at high speeds is unavoidable. These defects are avoided bythe integral construction ofthe work spindle frame and the tool frame inaccordance with the present invention. Moreover, with the integralconstruction of the work spindle frame and the tool frame, in accordancewith the invention, it is possible to obtain much greater accuracy inthe relative position of the work spindle to the tools and the guidebushing may be retained in accurate alignment with the spindle becausethe machining accuracy of a single part is superior to the machining ofseveralparts which must thereafter be assembled.

A further feature of the invention is. that instead of the work spindlehead being slidable on the machine bed, as in conventional latheconstruction, the work spindle is of q'uill construction and is slidablein the work spindle frame. Moreover, the work spindle is directlyconnected with a coaxial I or high frequency motor housed in the samework spindle frame, thereby making it possible to attain high speedrotation of the work spindle and high speed sliding of the quill whileat the same time affording facility of replacement andinterchangeability of the components. Moreover, in accordance with theinvention, the weight of the sliding part is much smaller than that ofthe conventional type and the rotating part is reduced in diameterthereby avoiding abnormal centrifugal force and unbalance due to thehigh speed of sliding and rotation and avoiding the occurrence ofvibration. Moreover, in the event repair or maintenance is required, thedown time of the lathe in accordance with the present invention isconsiderably less than in the case of the lathe of the conventionaltype.

A further object of the invention is to provide novel mechanism foropening and closing the work holding chuck of the spindle so that thechuck can be opened and closed easily and effectively even when thespindle is rotating at high speed.

Still another feature of the invention is that the spindle; a cam shaftcontrolling axial sliding movement of the spindle, opening and closingof the chuck and operation of vertical tools, and an attachment havingvarious tools for machining the front end surface of the work piece aredriven by individual motors respectively so that the conventionalintermediate shafting and gear box are eliminated, thereby eliminating asource of vibration.

The nature and objects of the invention will be more fully understoodfrom the following description of a preferred embodiment illustrated byway of example in the drawings, in which:

FIG. 1 is a front view of an automatic lathe in accordance with thepresent invention;

FIG. 2 is an end view of the lefthand end of the lathe as viewed in FIG.1;

FIG. 3 is a partial longitudinal section taken on the axis of thespindle;

FIG. 4 is a partial longitudinal section of a spindle feeding guide;

FIG. 5 is a partial cross section showing a chuck opening and closinglever anda spindle feeding device; and

FIG. 6 is a partial plan view showing the spindle feeding mechanism.

In the automatic lathe illustrated by way of example in the drawings, amachine bed 2 is mounted on the upper surface of a base 1. On'therighthand portion of the bed 2, as viewed in FIG. 1, there is mounted awork spindle frame 3 housing a 'quill type spindle 6 and a highfrequency motor 7 in axial alignment with the spindle. Moreover, theframe 3 includes an integral tool frame portion 3 which extends upwardlyand supports a tool holder 18 that holds a plurality of vertical tools 8selectively engageable with the work piece in front of the spindle andslidably mounted on a vertical slide 17, having a rearwardly projectingshank portion 17 which is received in a bore in the tool frame portion3' and secured by means of a nut 17a secured on to a threaded endportion of the shank 17. The one-piece construction of the work spindleframe 3 and the tool frame 3' provides rigidity which reduces vibrationand assures accurate positioning of the tool frame with respect to thespindle frame.

At the righthand side of the lathe, as viewed-in F IG; 1, a bracket 52mounted on the machine bed 2 supports a material supply device 5 thatsupplies bar stock to be machined to the working position throughaligned axial bores of the motor 7 and quill type spindle 6. On thelefthand end of the one-piece frame 3. there is securely mounted a guidebushing holder 21 in which a guide bushing 9 for the work piece isrotatably mounted. A rocking arm 20 pivotally mounted on the frame 3below the guide bushing holder 21 carries oppositely facing horizontaltools. This arrangement is well known in automatic lathes. At attachment4, having various tools for machining the front end surface of the workmaterial, is mounted on the upper surface of the lefthand portion of thebed 2, as viewed in FIG. 1. At the back of the bed 2, there is rotatablysupported a cam shaft 12 extending parallel to the spindle axis andcar.- rying cams for swinging the rocking arm 20 and imparting feedmovement to the vertical tools 8 mounted on the tool holder 18. The camshaft 12 also carries cams 35, 35 and 35" for moving the quill spindle 6axially and cams 46 and 47 for opening and closing the workholding chuckof the spindle, as will be described below. The cam shaft 12 is driventhrough a driving shaft 11 by a cam driving motor 10 installed in thebase 1 of the lathe. The attachment 4 is driven by a separate motor 13likewise installed in the base 1. In other words, the spindle, the camshaft and the attachment are driven individually by separate electricmotors. The motors 7, and 13, as well as other operating parts of thelathe, are controlled by a control box 16 mounted on the front of thebase 1. The work zone of the lathe, including the front end of thespindle 6 and the tools engageable with the work piece, is enclosed by acover 22 while a cover 22 is provided for the lefthand end of the lathe,as viewed in FIG. I. A further cover 5] provided for the righthand endof the spindle frame 3 is provided with an opening through which thework material is fed to the lathe by the supply device 5.

Now that the general construction of the lathe, as illustrated in FIGS.1 and 2, has been described, the spindle head and associated parts ofthe lathe will be described in more detail with reference additionallyto FIGS. 3 to 6. The quill spindle 6 is of the kind shown in copendingapplication Ser. No. 210,900, filed Dec. 22, l97l, corresponding toJapanese Application No. 118920/45 (1970), filed Dec. 26, 1970, andcomprises a hollow spindle rotatably mounted by means of ball bearingsin a tubular casing 6: called a quill. At one end, the spindle isprovided with a splined shaft portion 6' for connection to the highfrequency motor 7, while at the opposite end the spindle is providedwith a workholding collet chuck 6a for holding the work piece. Asdisclosed in the aforesaid application, the quill spindle is providedwith means including an actuating sleeve 39 for opening and closing thechuck.

The quill spindle 6 is slidably supported in the frame 3 for axialmovement by means of bearing bushings 23 and 24, disposed respectivelyat front and rear portions of the spindle (FIG. 3). Between the bushings23 and 24, the spindle frame 3 is provided with a window opening 3"formed in the center of the front side of the frame. This windowprovides access for connecting to the quill spindle 6 means for movingthe spindle axially in the bearing bushings 23 and 24. Although the highfrequency motor 7 is mounted in fixed position in the frame 3, axialmovement of the quill spindle 6 is permitted by the splined connection 6while maintaining a direct driving connection between the motor androtating spindle. At the central portion of the window opening 3", ablock 26 is secured by set screws on the outer periphery of the quill6q. An adjusting plate 27 is secured on the under surface of the block26, for example by a pin 27a, and is provided on its lefthand surface asviewed in FIG. 3 with an abutment plate 28. (FIGS. 3 and 5).

Means for axially moving the .quill spindle 6 further comprises cams 35,35 and 35" on the cam shaft 12 (FIG. 6). When bar material is beingmachined by a combination of various machining-steps, for example screwcutting, taper shaping, cutting off, etc., the combination of the amountand speed of the feeding movement becomes quite complicated with theresult that a single cam satisfying all of the requirements would becomplex and difficult to machine. This difficulty is avoided byproviding a plurality of cams each performing one or more separatemovements of the quill spindle as required by the work to be performed.While three cams have been shown by way of example in the drawings, itwill be understood that the number of cams is variable and can beselected according to the complexity of the work. Moreover, the cams aremounted on the cam shaft 12 in such manner as to be interchangeable sothat different cams can be used for different jobs. The cams 35, 35, 35"are engageable respectively by cam followers 36, 36, 36" adjustablymounted on a holder 14 that extends underneath the quill spindle 6 andis slidable on a guide plate 30 in a direction perpendicular to the axisof the cam shaft 12 (FIGS. 3 and 6). At its forward end the cam followerholder 14 is provided with a bearing plate 14a which is engageable by aroller 31 on one arm 15a of a Radiax lever 15 which is pivoted on bothends of a pin 32 extending through a hole in a forward projectingportion 2a on the front side of the bed 2. The Radiax lever 15 is formedas a bell crank with a second arm 15b perpendicular to the arm 15a. Aroller 33 on the arm 15b is engageable with the abutment plate 28 of theblock 26 secured to the quill 6q of the quill spindle. The roller 33 ismounted on the arm 15b in such manner that its distance from the pivotpin 32 can be selectively varied. For this purpose the roller 33 isrotatably mounted on a follower 3311 which is slidable in a longitudinalslot 15 in the arm 15b of the bell crank lever 15 and engages a screwshaft 34 which is rotatably supported in the arm 15b and can be turnedby means of a projecting knob 34a. According, by rotating the screwshaft 34, the roller 33 is shifted along the longitudinal groove 15 andthe lever ratio of the lever 15 is accordingly adjusted. By reference toFIG. 6 it will be seen that if. the holder 14 is moved forwardly byengagement of one of the cams 35, 35, 35" with one of the cam followers36, 36', 36", the lever 15 will be turned in a clockwise direction byengagement of the holder 14 with the roller 31 and the quill spindle 6will be moved toward the right by engagement of the roller 33 on thelever arm 15b with the abutment plate 28. the amount of movementdepending on the amount of movement of the holder 14 by a. cam and onthe lever ratio of the lever 15 as determined by the selected positionof the roller 33 along the lever arm 15b.

Means is provided for holding the spindle quill 6q against rotation andfor biasing it in a direction toward the left as viewed in FIG. 6 so asto maintain the abutment plate 28 in engagement with the roller 33 onthe lever 15. As seen in FIGS. 4 and 5 the front portion of the block 26is provided with an L-shaped recess to receive a central portion 38' ofa guide bar 38 which extends parallel to the quill spindle axis. Thecentral portion 38 of the guide bar is of rectangular cross section andis secured to the block 26 by a holder 37 held by one or more screws37a. The guide bar 38 has opposite end portions of round cross sectionslidably received in guide holes 3a and 3b bored in correspondingpositions in the frame 3. An axial hole is bored in the right hand endportion of the bar 38, as viewed in FIG. 4, to receive one end of acompression spring 48 the opposite end of which is received in a linearextension 30 of the hole 3b in frame 3. The spring 48 is held undercompression between the bar 38 and a spring seat 49 positioned by anadjusting screw 50 which extends through the cover 51 and closes therighthand end of the bore 3c as viewed in FIG. 4 The bar 38 serves as aguide for the axial sliding movement of the quill spindle 6 as well as astop to prevent the turning of the quill 6: The spring 48, actingthrough the guide bar 38, exerts a force on the quill spindle 6 so as totend to move it axially toward the left, as viewed in FIGS. 3, 4 and 6,and thereby press the abutment plate 28 against the roller 33 of thelever 15, thus tending to swing the lever in a counterclockwisedirection, as viewed in FIG. 6, to move the holder 14 rearwardly andthereby bias the cam followers 36, 36, 36" toward the cams 35, 35 and35". Thus the earns 35, 35 and 35" act through the followers 36, 36,36", holder 14 and Radiax lever to move the quill spindle 6 toward theright, as viewed in FIG. 6, while the spring 48 acting through the guidebar 38 tends to move the quill spindle toward the left.

As indicated above, means is provided for opening and closing the colletchuck 6a, located at the forward end of the spindle rotatably supportedin the quill 6q without stopping the high speed rotation of the spindle,whereby the work material is chucked or unchucked as required. As statedabove, the quill spindle is of the construction shown and described incopending patent application, Ser. No. 210,900, and includes achuckactuating sleeve 39 having a screw thread engaging a correspondingscrew thread provided on the inner periphery of the quill 61 so thatrotation of the chuck actuating sleeve 39 results in its being movedaxially of the quill 6: A sliding sleeve rotatably supported in thechuck-actuating sleeve 39 and movably axially with it is engageable withballs which extend through openings inthe spindle and are engageable inturn with an axially movable chuck operating sleeve inside the spindle.When the chuck-actuating sleeve 39 is rotated in a direction to screw ittoward the chuck end of the spindle, the sliding sleeve moving axiallywith the chuckactuating sleeve 39 presses inwardly on the balls toretract the chuck operating sleeve against spring bias and thereby openthe chuck. Conversely, rotation of the chuck-actuating sleeve 39 in theopposite direction results in closing of the chuck. This operation willbe clear from the copending application.

1 The chuck-actuating sleeve 39 is rotatable by means ofelongated gearteeth which are provided on its outer periphery and intermesh with agear 40 which is rotatably supported on a pin 41 secured on a projectingportion of the frame 3 and extending through openings in the frame 3 andthe spindle quill 6q (FIG. 5). The gear wheel 40 furthermeshes with asector gear 42a on the forward. end of a lever 42 which. is pivotallysupported by a pin 43, secured at the end of a rearwardly projectingbracket portion 2 on the bed 2. The lever 42 is located above the camshaft 12, supported at the end of a bracket portion 2, similarlyprojecting rearwardly from the bed 2. A chuck opening cam 46 on the camshaft 12 is engageable with a follower roller 44 on the lever 42 to movethe lever and hence the sector gear 42a in a counterclockwise directionand thereby rotate the gear 40 in a clockwise direction and the chuckactuating sleeve 39 in a counterclockwise direction to open the chuck. Aclosing cam 47 on the cam shaft 12 is engageable with a follower roller45 on a right angle arm 42b of the lever 42 to move the lever and hencethe sector gear 42a in a clockwise direction and thereby rotate the gear40 in a counterclockwise direction and the chuck-actuating sleeve 39 ina clockwise direction to close the chuck. The cams 46 and 47 areangularly positioned on the cam shaft 12 so as to provide proper timingof the opening and closing of the chuck..ln H0.

5, the positions of the cam followers 44 and 45, shown in full lines,indicate the closed state of the chuck and the positions 44 and 45 ofthe followers, shown in dotdash lines, indicate the open state of thechuck. Thus, as the actuating sleeve 39 is made to rotate by the rota- 6tion of the cam shaft 12 acting through the cams, 46, 47, lever 42,sector gear 42a and gear wheel 40, it is possible to open andclose thechuck at definite times and positions without stopping the rotation ofthe spindle.

The length of the gear teeth of the chuck-actuating sleeve 39 and gear40 is sufficient that the teeth do not disengage even though the quill6q performs a feeding or working movement in an axial direction.

The cam shaft l2 also carries suitable cams acting through cam followersand levers 19 to impart feeding movement to the vertical tools 8 carriedby the tool holder 18. Since the tool holder 18 is mounted on anintegral portion 3' of the unitary frame 3 in which the quill spindle issupported and guided, precise correlation of the tools and a work piececarried by the spindle is assured. Moreover, the levers 19 are pivotallysupported by pins 19a mounted in holes provided in the portion 3' of theframe 3.

With the construction described above, the high rigidity provided by theone-piece construction of the Work spindle frame and tool frameeliminates structural weakness, assures greater accuracy in the relationof the parts-and minimizes vibration. The utilization of a quill typespindle capable of opening and closing the chuck and moving axiallywithout stopping the high speed rotation of the spindle makes itpossibleto obtain high speed rotation of the spindle as well as a high speedfeed stroke of the quill. Moreover, by driving the spindle, the camshaft and the end-working tool attachment by means of separate motors,gear boxes and intermediate shafting liable to cause vibration areavoided and construction of the lathe is simplified. The features inaccordance with the present invention thus provide an automatic lathecapable of operating at high speed with high efficiency and producingwork of high quality. i I

while the invention has been described by reference to a preferredembodiment shown by way of example in the drawings, it will beunderstood that it is in no way limited to the details of constructionof the illustrated embodiment.

What we claim and desire to secure by Letters Patent 1. In an automaticlathe, the combination .of a bed, a frame mounted on' said bed andcomprising a work spindle frame having a longitudinal horizontal boreand an integral tool holding frame projecting upwardly at one end ofsaid work spindle frame, a quill spindle assembly comprising a tubularquill non-rotatable and axially movable in said bore of said workspindle frame, a hollow spindle rotatable in said quill and movableaxially therewith and a chuck on said spindle for holding work to beturnedfmeans mounted on said tool holding frame for holding tools toengage said work, means for rotating said spindle, operating means formoving said quill axially while said quill is rotating, and operatingmeans for opening and closing said chuck while said quill is rotating,said operating means including a cam shaft rotatably supported by saidframe, cams on said shaft and cam followers operatively connectedwithsaid means for moving the spindle axially and said means for opening andclosing said chuck.

2. A combination according to claim 1, in which said cams include aplurality of coaxial cams jointly controlling axial movement of saidquill and said spindle and cam followers engageable respectively by saidcams.

3. A combination according to claim 2, in which said means for movingsaid quill and quill spindle axially includes a bell crank leverpivotally mounted on said bed, said lever having one arm actuatable bysaid cam followers and a second arm operatively connected with saidquill.

4. A combination according to claim 3, comprising a guide rod extendingparallel to the axis of said quill spindle and connected with said quilland spring means associated with said guide rod to bias said quill tomove axially in one directionv 5. A combination according to claim 3,comprising means for varying the lever ratio of said bell crank lever.

6. A combination according to claim 1, in which said means for openingand closing said chuck comprises a rotatable actuating sleeve in saidquill, said actuating sleeve having gear teeth on its periphery, a gearsector mounted for oscillatory movement on said bed, meansinterconnecting said gear sector and said gear teeth of said actuatingsleeve and cams on said cam shaft for imparting oscillatory movement tosaid gear sector to rotate said actuating sleeve and meansinterconnecting said actuating sleeve with said chuck to open said chuckwhen said actuating sleeve is rotated in one direction and to close saidchuck when said actuating sleeve is rotated in the opposite direction.

7. A combination according to claim 1, in which means for driving thespindle comprises a high frequency motor stationarily mounted on saidwork spindle frame, and means interconnecting said spindle with saidmotor for permitting movement of said spindle axially relative to themotor while transmitting rotary motion from the motor to the spindle,said motor having an axial passage through which the work passes.

8. A combination according to claim 1, further comprising operatingmeans including a cam on said cam shaft and cam follower means forimparting feeding movement to said tools mounted on said tool holdingframe in timed relation to axial movement of said quill.

9. A combination according to claim 1, further comprising a work guidingbushing rotatably mounted in said integral frame in axial alignment withsaid spindle.

1. In an automatic lathe, the combination of a bed, a frame mounted onsaid bed and comprising a work spindle frame having a longitudinalhorizontal bore and an integral tool holding frame projecting upwardlyat one end of said work spindle frame, a quill spindle assemblycomprising a tubular quill non-rotatable and axially movable in saidbore of said work spindle frame, a hollow spindle rotatable in saidquill and movable axially therewith and a chuck on said spindle forholding work to be turned, means mounted on said tool holding frame forholding tools to engage said work, means for rotating said spindle,operating means for moving said quill axially while said quill isrotating, and operating means for opening and closing said chuck whilesaid quill is rotating, said operating means including a cam shaftrotatably supported by said frame, cams on said shaft and cam followersoperatively connected with said means for moving the spindle axially andsaid means for opening and closing said chuck.
 2. A combinationaccording to claim 1, in which said cams include a plurality of coaxialcams jointly controlling axial movement of said quill and said spindleand cam followers engageable respectively by said cams.
 3. A combinationaccording to claim 2, in which said means for moving said quill andquill spindle axially includes a bell crank lever pivotally mounted onsaid bed, said lever having one arm actuatable by said cam followers anda second arm operatively connected with said quill.
 4. A combinationaccording to claim 3, comprising a guide rod extending parallel to theaxis of said quill spindle and conneCted with said quill and springmeans associated with said guide rod to bias said quill to move axiallyin one direction.
 5. A combination according to claim 3, comprisingmeans for varying the lever ratio of said bell crank lever.
 6. Acombination according to claim 1, in which said means for opening andclosing said chuck comprises a rotatable actuating sleeve in said quill,said actuating sleeve having gear teeth on its periphery, a gear sectormounted for oscillatory movement on said bed, means interconnecting saidgear sector and said gear teeth of said actuating sleeve and cams onsaid cam shaft for imparting oscillatory movement to said gear sector torotate said actuating sleeve and means interconnecting said actuatingsleeve with said chuck to open said chuck when said actuating sleeve isrotated in one direction and to close said chuck when said actuatingsleeve is rotated in the opposite direction.
 7. A combination accordingto claim 1, in which means for driving the spindle comprises a highfrequency motor stationarily mounted on said work spindle frame, andmeans interconnecting said spindle with said motor for permittingmovement of said spindle axially relative to the motor whiletransmitting rotary motion from the motor to the spindle, said motorhaving an axial passage through which the work passes.
 8. A combinationaccording to claim 1, further comprising operating means including a camon said cam shaft and cam follower means for imparting feeding movementto said tools mounted on said tool holding frame in timed relation toaxial movement of said quill.
 9. A combination according to claim 1,further comprising a work guiding bushing rotatably mounted in saidintegral frame in axial alignment with said spindle.